Hi Louise. The most common cause of later onset or acquired deafness in younger dogs in the absence of a history of ear infections is ototoxicity, usually from a range of veterinary drugs. You can find a list in this article, but the most common reaction is to aminoglycoside antibiotics. Therefore, I would be very interested in a detailed list of the treatments for the time your dog had the BB wound. Even if so, these reactions are unusual and unpredictable. Of course if the wound was on the cranium, there is another obvious cause but I would be surprised if the pellet could do that much damage.

Sorry James, you’ll need to visit a vet to decide if there is any possible treatment.

Did the firework go off while he was holding it? If so it could certainly cause hearing loss – a very unlucky and unusual cause. They usually recover from this over time. Good luck and make sure you check again with your vet if he’s not getting better.